4D ultrasound adds a temporal dimension parameter to the images of 3D ultrasound, enabling real-time observation of fetal dynamics. The 4D ultrasound can observe the fetus in the womb and can also help with malformations. The best time to have a 4D ultrasound is between 22-26 weeks of pregnancy. What is 4D ultrasound 4D ultrasound is a kind of ultrasound examination. In addition to the functions of general ultrasound, it can also perform three-dimensional imaging of the fetal head and face, which can clearly display the state of the eyes, nose, mouth and lower jaw, etc. It can assist doctors in directly diagnosing fetal congenital malformations, including surface malformations, visceral malformations and head and face malformations, and can determine the precise position of the fetus in the womb. In addition, 4D ultrasound adds a temporal dimension parameter to these functions, allowing real-time observation of the dynamic moving images of the fetus. Generally speaking, 4D ultrasound can detect major fetal abnormalities, such as congenital heart disease, cleft lip and palate, hydatidiform fetus, polydactyly and external ear. However, 4D ultrasound is not a panacea, for example, newborn deafness and cataracts cannot be detected. Pregnant women should understand the importance of 4D ultrasound screening and follow the time prescribed by the doctor. When is the best time to do 4D ultrasound? 22-26 weeks of pregnancy is the best time to do 4D ultrasound, because the fetus is about 24 weeks old and the brain is developing rapidly, the fetal structure has been formed during this period, the size of the fetus and the amniotic fluid are moderate, there is more space for activities in the uterus, the fetal bone echo is less affected and the image is clearer. The fetal skeletal echoes have less impact and the images are clearer. The best time to do 4D ultrasound varies from individual to individual, and the results obtained will be different according to the needs of 4D ultrasound. Generally speaking, the pregnancy period can be divided into three stages: the first trimester (January-March), the middle trimester (March-June) and the late trimester (June-September), and the 4D ultrasound results from these three periods are different. The results of 4D ultrasound in these three periods are different. Due to the individual differences of pregnant women, please contact your doctor for the specific time. 4D ultrasound is the most advanced color ultrasound equipment in the world, and many pregnant women will habitually ask their doctors whether the fetus is male or female after having 4D ultrasound. Although 4D ultrasound can see the sex of the fetus, during the examination, in order to avoid revealing the sex of the fetus, the doctor will actively avoid the sex characteristics of the fetus as well as the lower half of the body, and at the same time, during the post-production of the CD, the part that may reveal the sex of the fetus will also be processed. Therefore, although 4D ultrasound can detect the sex of the fetus, it is illegal to distinguish the sex of the fetus for non-medical purposes according to national regulations, and regular hospitals will not tell or imply the sex of the fetus through any means. In fact, whether it is a boy or a girl, it is the crystallization of the couple’s love. Parents-to-be should be more concerned about whether the fetus is healthy and developing normally than about the gender. What is 4D ultrasound examination 4D ultrasound is used to detect and screen fetal malformations and provide accurate scientific basis for early diagnosis of fetal congenital body surface malformations and congenital heart. 1.Fetal facial anomalies: such as cleft lip and palate; neurological system: anencephaly, hydrocephalus, microcephaly, spina bifida and cerebrospinal membrane bulge. 2, digestive system: umbilical intestinal bulge, visceral ectopia, intestinal atresia and megacolon, etc. 3.Urological system: hydronephrosis, polycystic kidney and giant bladder, urethral obstruction. 4.Other malformations: short limb malformation, joint malformation, cleft lip, four heart cavities, too much and too little amniotic fluid, etc. 4D ultrasound surface imaging is used for obstetric examination, which can not only observe the growth of the fetus, but also visualize the activities of the fetus in the mother’s body, such as: breathing situation, movement, including the whole body’s large movement, limb movement, and even the tiny swallowing movements of the fetus. The doctor can also observe whether the fetus is in good tone through the 4D ultrasound.